I live in the Upper Penninsula of Michigan which I guess has a similar climate to Canada. I'm definitely getting a heater, just trying to decide if the 150K BTU will work or if the 200K BTU would be needed. Here's the choices I have:

Hayward H200 for $1000 - Pool dealer made a mistake on my pool so they're giving me a good price on this heater.

Hayward H150 for $450 - A guy at work has one that is 3 years old but has never been hooked up. He said he'd go as low as $450.

Which one should I go with? Would like to have the pool going by next weekend. Thanks!